/*
 * Copyright [2013-2021], Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.polardbx.server.response;

import com.alibaba.polardbx.CobarServer;
import com.alibaba.polardbx.net.FrontendConnection;
import com.alibaba.polardbx.net.compress.PacketOutputProxyFactory;
import com.alibaba.polardbx.net.packet.ErrorPacket;
import com.alibaba.polardbx.net.packet.OkPacket;
import com.alibaba.polardbx.server.util.PacketUtil;

/**
 * 加入了offline状态推送，用于心跳语句。
 *
 * @author xianmao.hexm 2012-4-28
 */
public class Ping {

    private static final ErrorPacket error = PacketUtil.getShutdown();

    public static void response(FrontendConnection c) {
        if (c.isNeedReconnect()) {
            error.write(PacketOutputProxyFactory.getInstance().createProxy(c));
            return;
        }
        if (CobarServer.getInstance().isOnline()) {
            PacketOutputProxyFactory.getInstance().createProxy(c).writeArrayAsPacket(OkPacket.OK);
        } else {
            error.write(PacketOutputProxyFactory.getInstance().createProxy(c));
        }
    }
}
